Hand-drill appliance.



No. 'mr-2892, PATENTE@ JULY' 4:, 19M,

PATOE HAND DMLL APFLMNGE.

APPLIUATION FILED 1-"re1s.z6.1sml

M. MILLER @L U. T.

2 SHEETS-SHEET l.

TINTA/6858 f4; MyW/mw PATENTED JULY l, 19ML l: M MILLER @L T PTOK HAND DRLL APPLIANE..

APPLICATION FILED 11:13.26. 1904.

2 SHEETS-SHEET 2.

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ZV l l No. 793,99Q.

NTTnn STaTns Patented .Tuly 4, 1905.

PATENT OFFICE,

ERNST MORITZ MlLLER AND CHARLES THEO'DOR PfiTOCl, OF CHICAGO, lLLlNOlS.

MANIEKJWWIILL SPECIFICATXON forming part of Letters Patent No. 793,892, dated J u1y 4, 1905. Application iiled February 26, 1901i. Serial No. 195,393.

.To n/ZZ 1,077,017?, if; 7714137/ cm1/:077e:

Be it known that we, ERNST lvlonrrz Minnen and CHAI-Lus Timionon PA'rook, subjects of the German Emperor, residing at Chicago,

Cook county, Illinois, have invented certain new and useful .improvements in Hand-Drill Appliances, of which the following is a speciiication.

Our invention relates to hand drilling-ma- IO ehines, and has particular reference to appliances for increasing the efficiency and :facilitating the handling' of such machines, to the end of attaining' at least in part the advantage of the stability and power of fixed machines.

ln drilling holes tln'oug'h fixed metallic structures in buildings, such as stairways and the like, the ordinaryT machine-brace or hand-machine is commonly employed. The principal part of the labor imposed upon the 2O operator using a hand-drill in this way consists of exerting sui'fieient pressure upon the drill-point and holding it steady while doing so, the rotation of the drill being generally but a small fraction of the work.

'lfhe object of our invention is to provide means whereby an ordinary hand-drill may be secured to the work and the drill fed forward by means of a feed-serew or the like, thus relieving the operator of the strain of bodily pressure against the machine; to vastly increase the working capacity of both machine and operator; to facilitate true and exact work; and to enable the d rilling ofa number of holes within a certain range without removing' the parts from the work, 85o.; and theinvention consists in the novel construction and arrangement of parts hereinafter described in detail, illustrated in the drawings, and incorporated in the claims.

lin the drawings, Figure l is a view in side elevation of an ordinary hand-drill, together with our invention applied thereto and to a piece of work to be drilled. Fig. 2 is a plan view below the line X X of Fig. l. Fig. 3 is a top plan view of the elamping-plates and base-plate of the drill-support, the latter shifted in position. Fig. 4 is a view of the parts shown in Fig. 3, but shown in a plane at right angles to the plane of Fig. 3.

Figs. l

5 and 6 are respectively top plan and sectioned 50 end views of the lower plate of the clamp shown in Figs. 1 and 4. Fig. 7 is a view of the upper portion of the drill shown in Fig.

1 with the breastplate in position.

Referring to the drawings, 2 represents au 55 ordinary hand drill, commonly known as breast-drill, having the usual shank 3 for the breastplate or handle 3', vhich has been removed, the chuck 4:, etc., the details of the drill 2 being of the ordinary and well-known 60 kind. For the purpose of illustrating my invcntion I have selected the type of hand drilling-machine having' the body portion adjacent to the handle in elliptic-ring form, as shown at 5.

(i represents the frame supporting the drill, and said frame consists of a base-plate 7, into which are securely threaded two upright rods 8 8', having' lock-nuts 9 9 bearing against the plate 7. Said rods are threaded at their upper ends for the nuts l0 10 and 11 11', between which an apertured yoke 12 is clamped. Said yoke is provided at its ends with apertures or holes for the rods 8 8 and has a threaded aperture intermediate of its ends for the feedserew 13, provided with a hand-wheel 1st, by means of which it is rotated. The lower end of said feed-screw carries a collar 15, (taking the place of breastplate or shank rotatively secured to said screw and iitting over the shank 3, to which it is fastened by means of a set-screw 16.

17 and 18 are two pairs of clamps engaging the rods 8 8' and the upper and lower portion of the body of the drill. These clamps are secured together and upon the rods and drillbody by means of screw 19, threaded into one member of each clamp and passing through the other member, as clearly shown in Fig. 2.

2() and 20 are upper and lower plates of a 90 work-clamp. rlhe upper plate 20 has a suitable opening 21 for the drill -point and a threaded hole 22 for the thumb-screw E23, adapted to bear against the plate Q0 or the work 36. Revolubly lixed in said plate 2() is 05 a thumb-screw 25, threaded into the slide 2.6, which is provided with nf-shaped grooves 27, fitting knife-edge bearings 28, formed in the edges of rectangular opening' 29 in plate 20. i

The latter also carries a thumb-screw 30, threaded into its outer end. Said screw 30 has a revolubly-lixed presser toot or head 31 bearing against the upper plate 20, as shown in Figs. 1 and 4. The base-plate T is also provided with a rectangular aperture 29', having knife-edge bearings 32 Jfor the slide 33, the latter being similar to the slide 26, eX- cept that it has a free instead of threaded opening for the bolt 24C, fixed to the lower plate 20. The bolt 24 has a lock-nut Qi, adapted to clamp the base-plate 7 upon the upper clamp-plate 20.

34 is a drill-aperture in the base-plate T, drill-point 35 being shown in Fig. 1 as passing through the aperture 341, as well as opening 21, into the work or metal plate to be drilled, 36.

In operating our invention the brace 2 is clamped to the frame 6 by means ot' the clamps 17 and 18 and the collar 15 adjusted upon the shank 3. The clamp-plates 2O and 20' are then applied to the opposite sides of the work 36 and the screws 25 and 3() rotated to draw' said plates together, whereby the clamp is securely fastened. The base-plate 7 of the trame 6 is then adjusted upon the upper plate 20, and when said base-plate has been adjusted to bring the drill-point 35 opposite the place to be drilled the nut 2a and screw 9.3 are tightened, so as to keep the baseplate ixed with relation to the clamp-plate 20. In Eig. 3 the base-plate 7 occupies a position at right angles to that in which it is shown in Figs. 1 and 2, and the dotted lines in Fig. 3 illustrate the radius of adjustment in substantially the middle position. The circle of adjustment represented by the dotted lines may be contracted or expanded within the limits of movement ot' the slide 33. Then the hand-drill has thus been adjusted, all that is necessary is to turn the cra-nk ot the drill and to give the hand-wheel 14 oi the feed-screw 13 an occasional turn, as may be required by the progress ot' the drlll through j the work 36. All strain usually imposed upon l the operator in feeding the drill by bodily pressure is thus obviated, while the drill is held true and guarded against accidental breakage, as so frequently happens in using the hand-drill in the ordinary manner.

The clamps 17 and 18 will ot course be j modified in shape to conform to the contour of whatever form of drill-body is employed; but usually the simplest form of clamps will suffice for a large variety ot' such hand-machines. The clamp-plates 2O and 20 may likewise be adapted to accommodate themselves to other than the flat work 36 without departing from the spirit of our invention, which we accordingly do not desire to limit to the exact details of construction herein shown and described.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. The combination with a breast-drill, ot' a pair of clamping members, a drill-support adjustably mounted upon one of said members, means for holding the drill slidably in said support and means for adjusting said support and members slidably upon, and angularly relatively to, each other.

2. The combination with a breast-drill ot' a base-plate, a pair ot' rods secured to 'said plate at one end and having' a yoke at the opposite end, a feed-screw threaded into said yoke, means for keeping said drill parallel to said rods and for forcing same forward longitu dinally thereof, a clamp upon which said baseplate is mounted, means for adjusting said base-plate longitudinally and laterally with relation to said clamp and means for rigidly securing' said plates to each other and to the material to be drilled.

In testimony whereof we have hereunto subscribed our names in the presence ot' two witnesses.

ERNST MORITZ MILLER.

CHARLES THEGDOR PATOGK.

` lVitnesses:

PAUL GuRHAnD'r,

H. GuNscHI. 

